Connected: An Internet Encyclopedia
RFC 1123 - 3.3.3 Option Requirements

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### 3.3.3 Option Requirements

Every Telnet implementation MUST support the Binary option [TELNET:3] and the Suppress Go Ahead option [TELNET:5], and SHOULD support the Echo [TELNET:4], Status [TELNET:6], End-of- Record [TELNET:9], and Extended Options List [TELNET:8] options.

A User or Server Telnet SHOULD support the Window Size Option [TELNET:12] if the local operating system provides the corresponding capability.

DISCUSSION:

  Note that the End-of-Record option only signifies that a Telnet can receive a Telnet EOR without crashing; therefore, every Telnet ought to be willing to accept negotiation of the End-of-Record option. See also the discussion in Section 3.2.3.

Next: 3.3.4 Option Initiation

Connected: An Internet Encyclopedia
RFC 1123 - 3.3.3 Option Requirements